Discrete differential geometry is an lively mathematical terrain the place differential geometry and discrete geometry meet and engage. It offers discrete equivalents of the geometric notions and strategies of differential geometry, comparable to notions of curvature and integrability for polyhedral surfaces.

Where Γ is a lifted curve and f denotes df /dx. It follows that |Γ, Γx , . . x | = |Γ, Γy , . . y |(f )n(n+1)/2 , and, therefore, the Wronski determinant W (x) is a tensor density of degree n(n + 1)/2, that is, an element of Fn(n+1)/2 . 5). 4) are −n/2-densities. 3) it follows that the kernel of the operator A consists of −n/2-densities. It remains to note that the kernel uniquely defines the corresponding operator. The brevity of the proof might be misleading. 3 by a direct computation. g.